20110315

Introduction

When you buy jeans, you have to look at two measurements: waist and inseam. Just because you have a small waist doesn't mean you have short legs. Jeans come in all shapes and sizes! Waves also can be measured in two important ways: Amplitude and Frequency. Every wave has an amplitude, and every wave has a frequency. Having a large amplitude does not guarantee a large frequency! The chart below summarizes the lesson. Your work with GarageBand will help you digest that lesson.

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Activity

Study the diagram below and read the text for more detail.

GarageBand Instructions

1. Start a Project with a Piano: You can change the instrument if you know how, but a piano will be fine. (Click on the blue circle with an "i" in it to get the menu of available instruments.)
2. Practice a Musical Phrase: Use ⌘K to get the keyboard. You can click on the key icon to get the musical keyboard option.
3. Record Your Phrase: Use the red dot to start and stop the recording. Use the blue arrow to play and stop playing. If you don't like the phrase, delete it and try again!
4. Copy and Paste Your Phrase: Click in the green box and use ⌘C and ⌘V to create a copy. It may put the copy in a strange place! Find it and drag it to appear in sequence.
5. Adjust the Frequency of Your Phrase: Click on the scissors icon to see the Track Editor. Highlight the notes by clicking-and-dragging around them. Then drag them up or down to adjust the frequency up or down.
6. Adjust the Volume of Your Phrase: The arrow points to a volume control. If you do not see this section on your screen, you can show it by ⌘Y, or "Show Track Mixer" under the Track Menu.
8. Add a Narration Describing the Wave Properties": Add a new track, but choose "Real Instrument Track". Then when you highlight this track and press record, you can speak into the microphone to make the narration.

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